Jack



1. LAFRANCE. JACK.

'APPLICATION FILED FEB. 24, 1920.

1,362, 30, Patented Decf21, 1920.

In enfor" m: A Josey/2 Lafrance 6 r y M Afforney I UNITE sra'rrs PATE.rosnrn LArm'NcE, or monmm'm, QUEBEC, cannon, Ass'reiron'or ONE-HALE-TOI) omzsmn LAFRANCE, orMom'nEAL, CANADA.

' JACK.-

' To all whom it may concern:

, which exert an even Be it known that I, JOSEPH LAFRANCE, a Britishsubject, manufacturer, St. Jerome St, in the city of Montreal, in

the Province of Quebec, in the Dominion of Canada, have invented certainnew and use ful Improvements in Jacks; and I do hereby declare .thatthefollowing is a full, clear, and exact description of the same.

The present invention relates to jacks particularly adaptable toautomobiles and the like, and the main object of this invention is toprovide a device of this characterthat will be strong, easily operatedand simple and cheap of construction.

Another object is to provide a device of this character with movablecantaliver arms,

pulling on ushing action on both sides of the jack, t us ralsing evenlthe lifting head.

A f urther object is to provide a device of this character which willeliminate the Tratchet and toothed racks in jacks.

- To understand the invention reference will be had to in which I Figure1 is a side elevation of a jack according tothe invention, illustratedin" its the accompanying drawings unraised position.

-Fig. 2 is a side elevation showing the jack in it's raised pos'ition.-I

Fig. 3 is an elevation from the other side of a jack, two of thecantaliver, arms having been removed to disclose the central slotthrough which passes the worm.

ig. 4 is an enlarged sectional view through I one of the connectingmembers, in which is 2 1s ahollow member 4 which'is providedjo'urnaledthe unthreaded portion of the worm shaft.

i Fig. 5 is an enlarged sectional viewthrough the other connectingmemberwhich is provided with a thread to engage the worm shaft. Fig.- 6 is-aside elevation of an extension handle to be applied to the worm shafts.Likeinumerals of reference indicate correiponding. parts in eachfigure.

p n the drawings 1 is a' base thereof an u rig t'or 0st 2 provided withaplurality 0 holes 3;

itted oversaid post Specification of Letters Patent. Application filedFebruary 24, 1920. Serial No. 860,797. 7

residing at 10 The other ends a.

' threaded hole 19 4 It will readily be seen that when dle 21 is 1 jack..It will be late having interniediate is operated, the hollow member 4is 1 Patented.Dec.'21, 1920.

with a hole 5, and

6 is a pin whichis inserted through said hole 5 and through one of theholes 3 in order to adjust the height of said member 4.

Provided in the upper end of saidhollow member is a lifting-head 7having a depending stem 8 which has at its lowermost end, a slot 9 topermit the free passage-therethrough of a worm shaft 20 that Will bedescribed further. 7

Intermediate of the hollow member 4 is NT. F 1ca a slot 10 whichcorresponds to the slot 9 in the stem 8 and serves the same pu ose."

The lowermost end of the hollow mem er 4 is provided with two socketmembers 11, on each side thereof, and 12 are socket members provided oneach side of the lifting head 7 in which are pivotally secured thecantaliver arms or links 13 by means of the pins 14.

of the links 13 are connect ng socketed means of pins 17.

The 'socketed member 15 is provided centrally with an unthreaded member16 has a threaded hole 19. 20 is a w'ormshaft provided with a crankhandle 21 at one end, and 22 is a shoulder adapted to pivotally securedto the nibmbers 15 and 16 by rest against the socketed member 15. The

said worm shaft projects through the hole 18, the slot-10 in the member4:, the slot 9 in the stem member 8 and threads into the in thesocketed-member 16. the hfln turned, the shoulder 22 will rest ontheomember l5 and will carry said member inwardly, while at the sametime the worm shaft 20 will engage the threadedhole 19 and pull inwardlythe socketed member 16. As the members 15 and 16 are made to travelinwardlyand as the cantaliver arms or links 13 are hingedlysecured tothe socketed members 11'and'12 on the hollow memhead 7 the result isthat said-v ber 41, and the lihks will lift'the-head- 7, as the linksare gradually brought practically into a'vertical line, thus providing anost powerful lifting noted that before the jack adjusted on the base bymeans of the pin 6, which is. inserted in theholes 5 and 3.

- To lower the jack, the handle is turned in 6., the converging ends'hole 18, and the i the opposite direction and as already described, theweight on the lifting head will cause the links to regain their obliqueprimitive position, as the socketed members radually move away from thehollow mem er 4.

The handle 21 is removable from said worm shaft, in order to collapsethe device into compact form when not in uje.

In Fig. 6 of the drawings is disclosed an extension arm 23 provided at.on] end with a brace handle 24, the otherlend oifi said aim beingadapted to engage the universal joint 25 which is provided at the end ofthe worm' shaft 20. It will readily be understood that the extension arm23 when used in connec-' tion with the worm shaft will enable a personto operate the jack at a distance, from under the machine. 7

What I claim as my invention is 1 A jack comprising, in combination, avertical main member; :a vertical lifting member telescopically andslidably related thereto and havinga head at its -upper end,

said main and lifting members being provided with registering verticalslots; a pair of links pivoted at their upper ends to the posite sidesof said head; a pair of links pivoted at their lower ends to the lowerend of the main member at opposite sides thereof; a pair of connectingmembers to which the mutually-adj acent ends of the corre spondingfirstand second-named links are pivoted, each connecting member having ahole formed centrally and transversely through it; a horizontaloperating shaft extending through the registering slots in said main andliftmg members and journaled in other of which is. provided with a sintherewith pair of opening ings to retain said main member in adjusted.position; a pair of links pivoted at their lower ends to the lower endof the main member at o posite sides thereof; a vertical lifting mem 'rtelescopically and slidably related to the upper portion of the mainmember and 'rovided at-its upper end with a head, said lifting and mainmembers being 1 formed with registering vertical slots; a pair. of linkspivoted at their upper ends to the opposite sides of said ead; aconnecting members to. which the mutually-adjacent ends of the firstandsecond-named linksare pivoted; and an operating shaft extendinghorizontally through said registering slots and journaled in saidconnecting members.

Signed at Montreal, Quebec, Canada, this 9th day of February, 1920.

JOSEPH LAFRANCE. Witnesses: i Q O. PATENAUDE,

F. K. GILMOUR.

